[neonixie-l] Re: My little IN-13 Spectrum Analyser
Hi Paul, I've lost count of how many times I've viewed your video... A very nice job indeed! Best, Bob L. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/825c50cd-c58f-430e-8586-151784dd373f%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
I like your description. Inverting a DC level makes sense. Then you have to have the inverted notch voltage drive your IN-13 to the max at the center frequency of the notch filter. I suppose I was thinking too much about the frequency bandwidth of the bandpass. 18 somewhat narrow notches for the 18 audio channels up to 15KHz is probably a decent approximation for the audio range of frequencies. The video looks great !! Thanks. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/25ecdf37-c2c6-49eb-85ef-25eb5d7a1720%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
It is indeed a notch filter, all that happens is that I get a DC level out of the filter, which then feeds into a comparator chain, which effectively inverts it. On Wednesday, 28 February 2018 13:05:32 UTC, Jon D. wrote: > > I haven't done much of anything with filters, but isn't a Fliege filter a > notch filter. How did you turn it into a bandpass filter? Apologies if > this is a dumb question. > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/3cc435dc-b9d9-4159-9788-5e07ab3a526b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
I haven't done much of anything with filters, but isn't a Fliege filter a notch filter. How did you turn it into a bandpass filter? Apologies if this is a dumb question. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/60da3ad7-2c57-4575-b783-b0ae14e7f09c%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
No, current pull is not bad really, 125v and they are not all going to be lit all the time. The filters are Fliege filters, seem to do the job ok. On Wednesday, 28 February 2018 01:06:44 UTC, threeneurons wrote: > > That's a beaut ! I have a current obsession with color organs. Going to > make a couple with thyratrons. That plus neon, and my eyes definitely lit > up ! > > IN-13's use 4.5mA max. x18 channels its 81mA, so its not really that bad. > > What order filters ? Or trick it a little by upping the Q ? > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/d3938fb1-4a64-48f9-8bb1-425b1912eecb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
Thank you, they take about 4mA for FSD, however they rarely need to go right to the top - a little reservoir capacitor helps. The IN-13 has an extra lead, and has I guess like a pilot light at the bottom which helps the glow start at the right end. I've had a couple where the glow broke up, or did not reach the top of the tube, however you can burn them in just powered up for a couple of hours to fix that. On Tuesday, 27 February 2018 21:51:31 UTC, gregebert wrote: > > Neat! > > I'm surprised that the response on the IN-13's is pretty fast; I just > assumed they were sluggish. > How much current did it take to get maximum-scale ? I can see from the > video you get very close to the end. > > When I did some bench testing on the ones I bought a few years ago, static > testing above 3/4 scale often got weird behavior, such as lighting from the > opposite end. > Did you ever encounter that ? > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/c7fed4a9-c2ab-45f2-b0b8-33d3bd5f0ddb%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
Lovely as always, Paul. Are you using a multiplexed switched capacitor filter like the ltc1059, or lots of distinct channels? I only ask as I looked at something similar a couple of years ago - the traditional way was to use a whole bunch of individual discrete analogue bandpass filters. The approach I was looking at used a single switched capacitor filter that was analogue multiplexed across the bands I was interested in both in terms of the bandpass frequency and the output sample and hold. Used about 1/10th of the components. Cheers Nick -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/27056cc2-094a-4e6f-9f12-73e9ac9f8d3b%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
That's a beaut ! I have a current obsession with color organs. Going to make a couple with thyratrons. That plus neon, and my eyes definitely lit up ! IN-13's use 4.5mA max. x18 channels its 81mA, so its not really that bad. What order filters ? Or trick it a little by upping the Q ? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/cbca5a75-7897-43fd-b645-ba34e0cafd52%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
[neonixie-l] Re: My little IN-13 Spectrum Analyser
Neat! I'm surprised that the response on the IN-13's is pretty fast; I just assumed they were sluggish. How much current did it take to get maximum-scale ? I can see from the video you get very close to the end. When I did some bench testing on the ones I bought a few years ago, static testing above 3/4 scale often got weird behavior, such as lighting from the opposite end. Did you ever encounter that ? -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/30a71151-7f89-4b60-98e3-a55c18196c45%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
